Basic Steps:
- Restart your phone: A simple restart can often resolve temporary glitches.
- If there is a Sim card installed, ensure SIM card is properly inserted: Remove and reinsert the SIM card to ensure it's seated correctly.
- Check for SIM card damage: Inspect the SIM card for any physical damage
Network Settings:
- Reset Network Settings: This will remove any incorrect settings that may be causing the issue.
- Go to Settings > General > Reset > Reset Network Settings.
- Check Airplane Mode: Make sure Airplane Mode is turned off.
- Forget and Reconnect to Wi-Fi: Forget the Wi-Fi network and then reconnect.
Other Troubleshooting:
- Check for Software Updates: Ensure your phone's software is up to date.